Physics 4B, Lab # 2 Circuit Tools and Voltage Waveforms
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1 Physics 4B, Lab # 2 Circuit Tools and Voltage Waveforms OBJECTIVES 1. Become familiar with a DC power supply and setting the output voltage. 2. Learn how to measure voltages & currents using a Digital Multimeter. 3. Explore the voltage and current measurements in a simple series circuit. 4. Learn to use a function generator to create time-varying voltage patterns, and to control the amplitude, frequency, and waveform of these patterns. 5. Learn to measure and record these rapidly varying voltages using Capstone. EQUIPMENT DC power supply, digital multimeter (DMM), conducting wires, light bulbs, function generator, Capstone software (with Voltage Sensor hardware). THEORY The purpose of this laboratory exercise is to acquaint you with the equipment, so do not rush. Don t let one individual make all the measurements. You must become comfortable with the instruments if you expect to do well in future labs. Circuit Symbols: Power Supply Voltmeter Ammeter Light Bulb (Resistor) Our DC power supplies have three terminals, labeled as shown in the figure below: The main job of the power supply is to maintain a set voltage difference between the highvoltage (red, or +) terminal and the low-voltage (black, or "-") terminal. The third, green terminal, is connected to the "ground" of the power grid, which is usually considered "zero volts". Often, you will wire the black and green terminals together, meaning that black also represents room ground. When using a voltmeter (including a DMM on its "voltage" setting) to measure the voltage difference between two points, the voltmeter should connected in parallel (across) the element being measured, as shown in the figure below:
2 The value shown on the meter will be: Voltmeter Reading = (Voltage at Red Lead) - (Voltage at Black Lead) That is, if the leads are connected as shown in the figure, the reading will be positive. If the leads were reversed, the reading would be negative. Thus, if you don't know which of two points is at a higher voltage, the meter can tell you. Ammeters (the current setting on the DMM) are always connected in series with the branch in which the current is being measured, normally requiring that the circuit be broken and the meter inserted. Think of the current as being shunted through the meter: For an ammeter, a positive reading means that current (positive charge) is flowing in the red lead, through the meter, and out the black lead. A negative reading means the current is flowing the opposite direction. A Function Generator provides a voltage which varies with time as a sinusoidal, square, or triangular waveforms. Function Generators have dials to adjust both the frequency and amplitude of their waveform, but often the amplitude dial has no gradation markings. The only way to know the peak-to-peak amplitude of the signal you are producing is to measure it, either with a multimeter (on its AC voltage setting) or with an oscilloscope (or Capstone). The Function Generator's controls can then increase or decrease the amplitude to a desired value. PROCEDURE Part 1: Using the DMM to measure voltage differences The first voltage source you investigate will be a common 9-volt battery. (a) Set a digital multimeter to measure voltage. This will mean the black lead is plugged into the "COM" port, the red lead to the "V" port, and the main dial to "V" with a straight (rather than wavy) line over it. Can you predict what the meter will read if you touch its leads to the two terminals of the battery? (Answer this -- and any other "prediction" questions in labs -- before you proceed!) Actually touch the leads to the terminals. Was your prediction correct?
3 (b) What do you predict will happen if you reverse those two leads? What actually happens? Part 2: Using the DC Power Supply as a voltage source (a) Record the min/max output voltage and current specs written below the negative terminal. These, unsurprisingly, tell you the range of different voltages and currents your supply can provide. Find your power supply's positive (red) and negative (black) output terminals and check that the negative (black) is connected to the ground (green) terminal. (b) Identify the coarse and fine voltage adjustment knobs these will be the controls you use most often. The current adjust knobs and the hi/lo amps switch are used only to set an upper limit on the current to protect the circuit that will be tested in our experiment. For now, crank the current knobs all the way to the right, so the power supply is "willing" to provide the full current you recorded in part (a). (c) Turn on and test the power supply. Note that whenever power is on, either a green or a red indicator light will light up: green indicates normal (constant voltage) operation and red indicates the current limit has been reached. Use the coarse and fine adjust knobs to set the output voltage to 9 volts. Now use your multimeter to measure the voltage difference between the red and black terminals. Does the DC Power Supply seem to behave exactly like the 9-volt battery you used before? If not, in ways is it different? The biggest advantage your DC supply has over a battery is that its voltage is not fixed. Mess with the course and fine voltage adjust knobs. How does the voltage gauge on the face of the meter react? How do the readings on your multimeter react? (d) Your power supply contains built-in limits to protect against excessive current, which could damage both the supply itself and whatever circuit it is powering. To see these built-in safety features at work, "short" across the output terminals with a wire. (NOTE: never short any unprotected power supply, including those 9-volt batteries from before!) How do the readings on the supply itself, and on your multimeter (still set to read voltage), change? Do you see or hear anything else at the moment you close the short circuit? Set a second multimeter (or the same one, if multimeters are scarce) to measure DC current. This will mean the black lead is plugged into the "COM" port, the red lead to the "10 A" port, and the main dial to "Amps". Now you want to use the multimeter to measure the current flowing through that "short" wire on your power supply. To do that, you will need to break the circuit temporarily, and wire the leads so that the current flows through the multimeter. How does the reading on the multimeter compare to the readings on the power supply's gauges?
4 This is a good time to learn how those current-limit knobs work. Normally, they do not set the amount of current flowing through the power supply; instead, they set that safety "cutoff" value for current. However, when you short the supply, as you're doing now, it WILL give whatever maximum safe current you've set. Play with the find and course current-limit knobs. How does the current measured by your multimeter change? (e) Adjust the current limit to 0.6 A and then remove the short from the terminal points. You have now set the upper current limit; leave it there for the remainder of this lab. Also, set the output voltage to 10.0 volts, and leave it there for the time being. Part 3: Measuring Voltage and Current in a Simple Circuit In this section, the current and voltage of a DC series circuit will be determined by direct measurement using a DMM as well as with Capstone... (a) Construct the circuit below using a DC power supply (set to 10.0 volts, and 0.60 Amps max current), and two light bulbs.. Do the bulbs light? (If not, figure out what's wrong before continuing.). (b) You are going to use your DMM as before, to measure the voltage between the following three pairs of points: A and B, B and C, and A and C. Before you make any measurements, do you predict any particular relationship between these three readings? Make the measurement. Were your predictions correct? c) Now you are going to use your other DMM, as before, to measure the current passing through point A, the current through point B, and the current through point C. (Remember, current is trickier to measure than voltage -- you have to break the circuit and shunt the current through your meter.) Before you make the measurement, which do you predict will be greatest: the current through A,
5 through B, or through C? (Hint: you may want to consider the fact that when current is flowing in one direction, the actual flow of electrons is in the opposite direction.) Now, make the actual measurements. Did they come out as you expected? Why or why not? Part 4: Capstone Data Acquisition System While your digital multimeter is great for measuring steady voltages and currents, the Capstone software provides more versatile tools for measuring and recording pattens of voltage and/or current which change rapidly with time. Important: Capstone can be damaged by voltages above ±20 V. For now, that should not be a problem -- your DC power supplies cannot supply higher voltages than this -- but be careful never to connect it to anything that can produce higher voltages. Throughout this section, we will give very terse descriptions of what you want to set Capstone to do. Your instructor will help you learn to actually use the software, which is vastly easier when it is already running on your computer. (a) Go back to that 9-volt battery from the beginning of the lab. Use Capstone s Voltage Sensor, with a Digits and a Meter display, to measure the voltage difference between the terminals. Does it seem to match the measurements you got from your multimeter? ( b) Record at least a few seconds of data and display the data in a list. Is noise present in the voltage reading? Click the Statistics button (marked with a sigma) to display statistics and check both mean and standard deviation in the associated drop-down list. Record both the mean and the standard deviation in your lab notebook. (c) Now use the Voltage sensor to measure the voltage difference between the terminals of your DC power supply. Unlike the battery, you can change this voltage with the controls on the power supply. Do the Capstone readings reflect these changes in real time as you make them? Part 5: Capstone's Graphing function Use Capstone's Graph display to record a graph of measured voltage vs. time. As you mess with the voltage knob on your power supply, the changes should be reflected on the graph. Can you make the graph approximate a sine wave, with a frequency of half a cycle per second? How about a triangle or square wave with this same frequency? Can you manage a sine wave with a frequency of two cycles per second? 5 cycles per second? 500 cycles per second?
6 Have fun trying... Part 6: Function Generator & Capstone s Oscilloscope You probably found it difficult to follow those last few instructions from part 5. So let's learn about a tool that can automate the process for you: the Function Generator. (a) Connect Capstone s Voltage Sensor to the Function Generator's output terminals, and setup Capstone to display the a graph of the measured voltage. (b) Set the Function Generator to produce a sine waveform with a frequency of 5 Hz, and observe the graphed voltage in Capstone. Does the function generator do a better job of producing this signal than you could be hand? How about a 500-hz signal? How about a triangle or square wave? (c) Sometimes you want to watch a waveform change, in real time, in response to something happening in the circuit. For this purpose, Capstone's Oscilloscope function is an even better tool than its Graph function, because it does not overload your display or the computer's memory with old data. Set Capstone to an Oscilloscope display, and mess with all of the controls on your signal generator. Can you see the waveform changing in real time to reflect what you're doing? If any of the function generator's controls seem mysterious, mess with them, and see if you can figure out what they do by watching the Oscilloscope display. For one of the sine waves you produce, use Capstone's "Crosshairs" tool, possible with the "Delta Tool" option, to measure the period of the waveform. Does this measurement match the freqency displayed on your Signal Generator? (Hint: How is frequency related to period?) Also use the Crosshairs tool to try to set the peak-to-peak voltage of your signal to 10 volts. Can you see how this makes up for one of the limitations of the controls of the Signal Generator itself? Part 7: Capstone's FFT tool Finally, use a Capstone FFT display to observe the frequency spectrum of the signal generator output for a 500 Hz sine wave. Sketch the frequency spectrum. Repeat the above step for a 500 Hz square wave and a 500 Hz triangle wave. How do they differ and why? Can you (perhaps brainstorming with your classmates) figure out exactly what these FFT results are telling you about the signals?
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